Performance Tuning Tips
Compiled by Critical Path Software Inc.
All of these JCL Tuning TIPS were submitted from various sources and should
be tested prior to use.
CICS TUNING TIPS
• CICS has 8 LSR buffer Pools for DATA and 8 for INDEXES - Use them all.
• CI and CA Splits can greatly degrade response time. Check files and adjust.
• Code CI and CA Freespace very carefully and monitor regularly.
• REORG of files does NOT fix splitting problems, it just covers the problem up
for a short period of time. Allocate better FREESPACE.
• Avoid using Buffer sizes, which are not multiples of 1024.
• Use LOOK-ASIDE-HIT-RATIO to tune buffers.
• Turn ON all reports and use them.
• Great additional CICS Tips can be found at:
If you have a CICS TIP please e-mail it to us.
All of these TIPS have been sent to us and we take no responsibility for their
correctness. All of these TIPS should be tested before ever being placed into
If you have any CICS Tuning TIPS, please e-mail them to us at
Ralph@cpsigroup.com so we can inform others.
To get free lists of Mainframe Tuning TIPS for JCL, DB2, CICS, VSAM,
COBOL, etc., ask for them by e-mailing firstname.lastname@example.org
AS WITH ALL RECOMENDATIONS AND STANDARDS, THERE ARE ALWAYS
EXCEPTIONS TO THE RULES. ALL OF THESE TIPS HAVE BEEN COLLECTED
FROM MANY SOURCES AND ALL SHOULD BE TESTED BEFORE PUTTING
INTO PRODUCTION. THE ABOVE ARE MENT AS GENERAL GUIDELINES
ONLY. FINE TUNING IS AN ART, WHICH TAKES MANY YEARS OF
EXPERIENCE AND TESTING TO PERFECT.
Do you have a CICS TUNING TIP that we can put here?
Please send us an e-mail. It will help others.
Send to: Ralph@cpsigroup.com
Additional TIPS are posted on http://www.linkedin.com/pub/ralph-
If you send your e-mail address I will send them to you every time they are
updated. The JCL, COBOL, DB2, CICS, VSAM, SMS, and TSO TIPS will all be
sent. All of the TIPS have been sent in from donors so please test them. If you
ever have a performance problem give me a call. We do a free no charge no
Very Best Regards,
Ralph E. Bertrum
Principal - Critical Path Software, Inc.
An IBM Business Partner
http://twitter.com/RalphEBertrum Please connect.
Please connect with me on LinkedIn at http://www.linkedin.com/pub/ralph-
To get free lists of Mainframe Tuning TIPS for JCL, COBOL, DB2, CICS, VSAM,
SMS, and TSO ask for them by e-mailing Ralph@cpsigroup.com or
LinkedIn at http://www.linkedin.com/pub/ralph-bertrum/b/24a/471